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There's still some problems with the render, such as those strange black
splotches on the table adjacent to the clear sphere
Post a reply to this message
Attachments:
Download 'spheres_2.jpg' (117 KB)
Preview of image 'spheres_2.jpg'
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a truly excellent and imaginative Escher-inspired image, I say!
as for the blotches, perhaps something related to photons and low
max_trace_level?
the image itself is truly fantastic! And you get more points for doing it with
actual models rather than resorting to HDRI... :D
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Thanks! My global settings are listed below. What do you suggest I change?
global_settings {
max_trace_level 30
ambient_light rgb <1,1,1>
radiosity {
pretrace_start 0.08
pretrace_end 0.01
always_sample 0
//save_file "radiosity_data.inc"
//count 20
count 1000
nearest_count 10
error_bound 0.05
recursion_limit 5
low_error_factor 0.2
gray_threshold 0.4
minimum_reuse 0.010
brightness 1
max_sample -1
normal off
adc_bailout 0.01/2
}
}
"nemesis" <nam### [at] gmail com> wrote:
> a truly excellent and imaginative Escher-inspired image, I say!
>
> as for the blotches, perhaps something related to photons and low
> max_trace_level?
>
> the image itself is truly fantastic! And you get more points for doing it with
> actual models rather than resorting to HDRI... :D
Post a reply to this message
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jhu wrote:
> There's still some problems with the render, such as those strange black
> splotches on the table adjacent to the clear sphere
Oddly enough, those splotches could pass for part of the wood texture.
I like this image. :-)
--
William Tracy
afi### [at] gmailcom -- wtr### [at] calpolyedu
You know you've been raytracing too long when your wife walks into the
room wearing only a smile and you start thinking of Colefax's fur macro.
-- Ken Tyler
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jhu escreveu:
> Thanks! My global settings are listed below. What do you suggest I change?
hmm, no photons for caustics? It seems radiosity is creating some weird
kind of caustics by its own, except it's black!
Now, count 1000 and error_bound .05?! whew! Took a few days to render,
huh? ;)
In my radiosity scenes I like more fine-grained radiosity shading so I
generally go for pretrace_start 0.04 and pretrace_end 0.008 or something
like that. But I go with error_bound .2: it's acceptably slow and
gives good results for the blending of blotches, specially coupled with
nearest_count of about 16. Count is about right, though I first try
with lower counts, like 200 to 600...
As for the dark spots, the correct way to get caustics in povray is with
photons. Radiosity has problems with black spots and glass surfaces.
Use a first radiosity pass without the reflective or transparent
surfaces, save that rca file and then render the final image with
photons and the reflective/transparent surfaces back. Test without
photon first, then good luck. :)
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OK, thanks. Never played around with photons before. I'll give it a shot. BTW,
it's "only" a 16 hour render at those settings...
nemesis <nam### [at] gmailcom> wrote:
> jhu escreveu:
> > Thanks! My global settings are listed below. What do you suggest I change?
>
> hmm, no photons for caustics? It seems radiosity is creating some weird
> kind of caustics by its own, except it's black!
>
> Now, count 1000 and error_bound .05?! whew! Took a few days to render,
> huh? ;)
>
> In my radiosity scenes I like more fine-grained radiosity shading so I
> generally go for pretrace_start 0.04 and pretrace_end 0.008 or something
> like that. But I go with error_bound .2: it's acceptably slow and
> gives good results for the blending of blotches, specially coupled with
> nearest_count of about 16. Count is about right, though I first try
> with lower counts, like 200 to 600...
>
> As for the dark spots, the correct way to get caustics in povray is with
> photons. Radiosity has problems with black spots and glass surfaces.
> Use a first radiosity pass without the reflective or transparent
> surfaces, save that rca file and then render the final image with
> photons and the reflective/transparent surfaces back. Test without
> photon first, then good luck. :)
Post a reply to this message
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Did you use sky_sphere? Radiosity doesn't
play well with infinite distance backgrounds,
it can cause dark spots. Use an inverted sphere
for the sky...
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On Thu, 24 Jan 2008 19:23:44 EST, "jhu" <nomail@nomail> wrote:
>There's still some problems with the render, such as those strange black
>splotches on the table adjacent to the clear sphere
I do like this very much. The level of detail is very good, I am sure that I can
see texture on her sweater. Is she the sort of person who holds a mug and puts
her fingers through the handle?
I' getting lost in this :)
And I love self referral in anything.
Excellent!
Regards
Stephen
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Very nice, I always like a good Escher tribute. Looks very real. Good wood
texture! It's also quite dark but this works well.
If you solve the blotchiness (looks like radiosity artifacts to me) and
re-render it, then you might also consider using a longer camera angle to
prevent the outer spheres being stretched by perspective (if this means putting
it outside the room then the no_image keyword might come in handy). Just a
thought!
keep it up
Bill
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Tim Attwood napsal(a):
> Did you use sky_sphere? Radiosity doesn't
> play well with infinite distance backgrounds,
> it can cause dark spots. Use an inverted sphere
> for the sky...
>
>
Does it? I'll try it, thanks!
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